I believe this tool had been broken for a bit but is now functional again with assistance from Donald and donny. All credit belongs to scuti, Donald, donny, and the other folks who helped to make this tool. You can download the .zip here: https://drive.google.com/open?id=1Pg4rVdB2_r7XYa3sQM585wEHYadZDWXw
Copy+pasta from the README.txt:
reflex2q3 - Map conversion from Reflex to idTech 3 engine
This is a command line application for Windows.
reflex2q3.exe input.map output.map -e sample.ent
Help and all command line options:
For extra information refer to:
Source code repository: